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9961 (1991 XK)
Classification: Main-belt Asteroid          SPK-ID: 2009961
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2456800.5 (2014-May-23.0) TDB
Reference: JPL 4 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1052546506721729 7.604e-08  
a 2.241096055560189 1.5366e-08 AU
q 2.005210273109417 1.6576e-07 AU
i 4.855910698701303 8.5104e-06 deg
node 239.985237805672 7.5578e-05 deg
peri 290.7691693655324 8.5888e-05 deg
M 159.5723853133158 4.0801e-05 deg
tp 2456257.319250609354
(2012-Nov-25.81925061)
0.00013735 JED
period 1225.431765005488
3.36
1.2603e-05
3.451e-08
d
yr
n .2937740070728359 3.0213e-09 deg/d
Q 2.476981838010961 1.6983e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      828  
   data-arc span      13578 days (37.17 yr)  
   first obs. used      1976-05-02  
   last obs. used      2013-07-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .57603  
   data source      ORB  
   producer      Otto Matic  
   solution date      2013-Aug-05 16:30:17  

Additional Information
 Earth MOID = 1.01688 AU 
 T_jup = 3.622 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.2 mag n/a PDS3 (MPC 33662)  

9961 (1991 XK)          Discovered 1991-Dec-04 by Ueda, S., Kaneda, H. at Kushiro (399)
Reference: 19990202/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1991 XK = 1976 JT = 1989 BP 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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